JPH0449153Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mold for forming plate glass heated to near its softening point into a predetermined shape.

(Prior art) When molding curved glass such as automobile window glass, if the plate glass is brought into direct contact with the molding surface of the mold, part of the glass plate may stick to the molding surface or the glass plate may be partially cooled. This causes optical distortion.

Therefore, in the past, glass fiber was used on the molding surface.
A woven fabric made of silica fiber, alumina fiber, or carbon fiber is attached to prevent glass from adhering to the molding surface and to provide heat insulation between the molding surface and the glass.

(Problem to be solved by the invention) As mentioned above, when a woven fabric is provided on the molding surface, it is possible to suppress the adhesion of glass and the occurrence of optical distortion. The contact pressure between the glass and the woven fabric is high, and the glass slips during molding in this area, resulting in severe wear of the woven fabric.
The fabric must be changed frequently.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a surface material made of metal fibers woven in a highly stretchable weaving method on the molding surface of a glass mold.

(Function) The surface material is made of metal fibers, so it has excellent durability.
Furthermore, even if the metal fibers thermally expand or contract, the surface material has extremely high elasticity, so the expansion and contraction is absorbed and no fine irregularities are formed on the glass surface.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a front view of a molding device to which a mold according to the present invention is applied. The molding device 1 is composed of an upper mold 2 and a lower mold 3, and the upper mold 2 is hollow and serves as a molding surface. As shown in FIG. 2, cooling air blow-off holes 4 are formed on the bottom surface.

Further, a surface material 6 is attached to both the molding surface of the upper mold 2 and the molding surface of the lower mold 3 with an adhesive 5. This surface material 6 is made of knitted metal fibers,
It is knitted using methods such as rubber knitting, ridge knitting, or garter knitting, and is extremely stretchable.

Here, the thickness of the surface material 6 is 0.05 mm to 0.05 mm.
The diameter of the metal fiber is 1.0 mm, preferably about 0.1 mm, and the diameter of the metal fiber is 0.04 mm to 0.4 mm, preferably 0.08 mm.
Approximately mm.

FIG. 3 is a cross-sectional view showing the structure of metal fiber,
The metal fiber 7 has a structure in which the periphery of an iron core 8 is covered with a thin copper wire 9 or copper plating is applied, and the outer periphery is further plated with tin 10. With such a structure, a metal fiber that is resistant to rust and has excellent durability can be obtained. In addition to the structure described above, the structure of the metal fiber may be a copper core with tin plating, or a single wire made of an alloy of copper and nickel.

By the way, Fig. 1 shows a forming apparatus that transports the plate glass G in a horizontal state and press-forms it facing between the upper mold 2 and the lower mold 3. The present invention can also be applied to a molding device that carries a plate glass vertically between the molds 11 and 12 and press-forms it. When press-molding plate glass in a vertical state, generally only the circumferential portion 11a of the concave mold 11 is used as a molding surface, so the surface material 6 is provided on the entire surface of the circumferential edge portion 11a.

(Effects of the invention) As explained above, according to the invention, a surface material with extremely excellent elasticity made of woven metal fibers is provided on the molding surface of the glass mold. Even if the metal fibers expand when the surface material comes into contact with the heated glass, the surface material itself absorbs this expansion, so wrinkles due to expansion do not occur as with conventional woven fabrics, but Therefore, optical distortion such as perspective distortion and reflection distortion caused by wrinkles on the glass surface does not occur.

In addition, since the surface material is made of metal fibers, it has excellent wear resistance, so even if it is installed on the small rounded part of the molded surface, it will not easily tear and will need to be replaced frequently. can be extended to a wide width.

[Brief explanation of the drawing]

FIG. 1 is a front view of a molding device to which a mold according to the present invention is applied, and FIG. 2 is a partially enlarged sectional view of the mold.
FIG. 3 is an enlarged cross-sectional view of a metal fiber, and FIG. 4 is a perspective view of another molding apparatus to which the mold according to the present invention is applied. In addition, in the drawing, 1 is a molding device, 2, 3, 11, 12
is a mold, 6 is a surface material, and 7 is a metal fiber.

Claims (1)

[Claims for Utility Model Registration] (1) A mold in which a surface material is attached to a molding surface for molding plate glass, characterized in that the surface material is woven with metal fibers in a highly elastic weaving method. A mold for glass. (2) The mold for glass according to claim 1, wherein the weaving method is one of stockinette knitting, rubber knitting, ridge knitting, and garter knitting.